Disperse Of Palygorskite Nano-material In PF And Its Impact For Friction Brake

With the development of economic, higher speed, more load and better security of transport and other machines are required in morden industry. Friction materials for brake system should be designed to maintain stable and reliable friction force at wide ranges of pedal pressure, vehicle speed, temperature and others. Matrix resin performance is a major impact for materials of Brake. This paper concentrates upon improving the phenolic resin that is base of the brake by nano-materials modifying. It is a key point for nano-material diepersed in PF. The process performances were stuied in this paper, also brake friction and wear properties is improved in high temperature.Palygorskite mineral have excellent properties in physical and chemical. Nano-Palygorskite dispersing in PF uniformly can improve the PF that will be given better friction performances just like heat resistant, anti-wear and so on, those performances are need in brake.To get the proper process about making nano-palygorskite material, comparison experiments were used dry, wet and dry-wet milling process. And results show that the dry-wet milling process received nano-particles that like ball and shot needles, also its nano-rate is higher than others.Palygorskite has special crystal structure that contains many hydroxyls. KH550-a kind of silane coupling agent was used to connect with nano- palygorskite that contain many hydroxyls in its surface. So palygorskite nanoparticles surface was modified by KH550, they linked with chemical bond. This construction will improve combination with polymer resin. Reasonable modifications of parameters were received in this paper.Ultrasonic has been used for dispersing the nano-palygoskite in PF system. Change process parameters, and then obtain the best dispersed parameters. Later test with TEM shown that the nano-palygorskite was scattered well under both modified and ultrasonic. So palygorskite nanoparticles can be distributed fairly well under surface modified and ultrasonic. Sever pieces of brake were made by different methods of modified PF in the experiments. Then those brake tests were carried out, access to relevant friction and wear performance. Through comparative analysis, the results are shown: modified PF obtained better performances of the heat resistant and wear rate, also dispersion of different PF prepared for the friction brake-received by the friction and wear properties are differences, palygorskite Nano-dispersion of good friction brake performance and recession-resistant, and wear rates lower.